I bought bitcoin from coinmama and sent it to my bitcoin core wallet, but after the syncing was done I don't see that my wallet has been credited. Has anyone else experienced this issue??
A few questions to ask:
$ bitcoin-cli importprivkey <WIF>
If your transaction is visible at your address in a block explorer and not visible through your wallet, it means that your wallet is incompletely synchronized. If your transaction is not visible in a block explorer, it could mean coinmama didn't send it (or sent it to the wrong address). They should have given you a transaction ID, which you can also look up in a block explorer.